1. Pharmaceutical Materials Science and Engineering Laboratory, Department of Pharmaceutics, College of Pharmacy, University of Minnesota, 9-127B Weaver-Densford Hall, 308 Harvard Street S.E., Minneapolis, Minnesota 55455, United States
2. Pfizer Worldwide Research and Development, Sandwich CT13 9ND, U.K.
3. Pfizer Worldwide Research and Development, Groton, Connecticut 06340, United States